* Possible Causes: The behavior you describe points towards a combination of issues, likely a serious infection or neurological problem.
* Swim Bladder Disorder: This is a common problem in bettas, but it usually causes them to float or sink at an odd angle, not stand straight up.
* Bacterial Infection: Betta fish are prone to bacterial infections. Symptoms can include lethargy, loss of appetite, and unusual swimming patterns.
* Parasites: Internal parasites can cause weakness and neurological issues.
* Water Quality Issues: Extremely poor water quality can lead to various health problems.
* Why Immediate Action is Crucial: This behavior is not normal for a betta fish. The inability to maintain balance and falling sideways indicates a severe problem, possibly a serious infection or neurological issue. Delayed action can worsen the condition and may lead to the fish's death.
What to Do:
1. Seek Veterinary Help: Contact a veterinarian who specializes in aquatic animals (aquarium vets are ideal) immediately. They can diagnose the issue and recommend the best course of treatment.
2. Monitor Closely: While waiting for veterinary help, monitor your betta's behavior and any other symptoms.
3. Water Quality: If you haven't recently done a water change, do so immediately. Check the water parameters (ammonia, nitrite, nitrate, pH) using a test kit.
4. Isolate: If you have other fish in your tank, isolate the sick betta to prevent the spread of any possible infection.
Remember, timely intervention is crucial for the health of your fish. Don't hesitate to seek professional help.